Volume 514, May 2010
|Number of page(s)||4|
|Published online||27 May 2010|
Letter to the Editor
Spectroscopic parameters and rest frequencies of isotopic methylidynium, CH+
I. Physikalisches Institut, Universität zu Köln,
Zülpicher Str. 77, 50937 Köln, Germany e-mail: firstname.lastname@example.org
Accepted: 26 April 2010
Context. Astronomical observations toward Sagittarius B2(M) as well as other sources with APEX have recently suggested that the rest frequency of the J = 1–0 transitions of 13CH+ is too low by about 80 MHz.
Aims. Improved rest frequencies of isotopologs of methylidynium should be derived to support analyses of spectral recording obtained with the ongoing Herschel mission or the upcoming SOFIA.
Methods. Laboratory electronic spectra of four isotopologs of CH+ have been subjected to one global least-squares fit. Laboratory data for the J = 1–0 ground state rotational transitions of CH+, 13CH+, and CD+, which became available during the refereeing process, have been included in the fit as well.
Results. An accurate set of spectroscopic parameters has been obtained together with equilibrium bond lengths and accurate rest frequencies for six CH+ isotopologs: CH+, 13CH+, 13CD+, CD+, 14CH+, and CT+.
Conclusions. The present data will be useful for the analyses of Herschel or SOFIA observations of methylidynium isotopic species.
Key words: molecular data / radio lines: ISM / submillimeter: ISM / ISM: molecules
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.